v3.26.3
S000000545 [Member] N-1A Cover
May 31, 2026
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name Nuveen Multistate Trust I
Entity Central Index Key 0001018972
Entity Investment Company Type N-1A
Document Period End Date May 31, 2026
Prospectus Date Sep. 30, 2026